21845241 has 16 divisors (see below), whose sum is σ = 35305920. Its totient is φ = 13239360.

The previous prime is 21845237. The next prime is 21845249. The reversal of 21845241 is 14254812.

It is not a de Polignac number, because 21845241 - 2² = 21845237 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21845249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36480 + ... + 37073.

It is an arithmetic number, because the mean of its divisors is an integer number (2206620).

Almost surely, 2^21845241 is an apocalyptic number.

It is an amenable number.

21845241 is a deficient number, since it is larger than the sum of its proper divisors (13460679).

21845241 is a wasteful number, since it uses less digits than its factorization.

21845241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73573 (or 73567 counting only the distinct ones).

The product of its digits is 2560, while the sum is 27.

The square root of 21845241 is about 4673.8892798183. The cubic root of 21845241 is about 279.5453548645.

The spelling of 21845241 in words is "twenty-one million, eight hundred forty-five thousand, two hundred forty-one".